1665225652 has 12 divisors (see below), whose sum is σ = 2924092836. Its totient is φ = 829770560.

The previous prime is 1665225649. The next prime is 1665225713. The reversal of 1665225652 is 2565225661.

It can be written as a sum of positive squares in 2 ways, for example, as 934280356 + 730945296 = 30566^2 + 27036^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 709249 + ... + 711592.

It is an arithmetic number, because the mean of its divisors is an integer number (243674403).

Almost surely, 2^1665225652 is an apocalyptic number.

It is an amenable number.

1665225652 is a deficient number, since it is larger than the sum of its proper divisors (1258867184).

1665225652 is a wasteful number, since it uses less digits than its factorization.

1665225652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1421138 (or 1421136 counting only the distinct ones).

The product of its digits is 216000, while the sum is 40.

The square root of 1665225652 is about 40807.1764766934. The cubic root of 1665225652 is about 1185.2893006084.

Subtracting 1665225652 from its reverse (2565225661), we obtain a palindrome (900000009).

The spelling of 1665225652 in words is "one billion, six hundred sixty-five million, two hundred twenty-five thousand, six hundred fifty-two".